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    MisterE's Avatar
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    Port Area/Box for 18" BTL

    Gonna build a ported box for a new 18" BTL and need to know how much port area to feed it.

    I have about 13 cubes to work with so any airspace reccomendations would be great too, daily driver. thanks







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    mcsoul's Avatar
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    Re: Port Area/Box for 18" BTL

    14-16 inches per cubic foot. Something like this should workout. You might want
    to double face it.




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    Re: Port Area/Box for 18" BTL

    If i do two seperate ports the combined area comes out to around 123 in w/ each port being 20.5x3. should be enough?




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    Re: Port Area/Box for 18" BTL

    Quote Originally Posted by MisterE View Post
    If i do two seperate ports the combined area comes out to around 123 in w/ each port being 20.5x3. should be enough?
    That's great, as long as you do the math to determine the depth of the
    ports given you box's net cubic feet and tune.



    ________________________
    Car: 2004 Nissan Altima 3.5 manual
    Head unit: Alpine CDA-9815 (running active)
    Midbass: Morel HU-621 Hybrid Uniflow 8 ohms
    Mid Amp: Audison lrx 4.300 bridged 2x140w @ 8 ohms
    Doors: 24ft Damplifier Pro, Second Skin D-flex pads, eggcrate foam, sealed up.
    Tweeter: SEAS 27TFFNC
    High Amp: Audison Lrx-2.150
    Subs: Two RE SE 12 d4's
    Box: 4 cubes net at 30hz
    Sub Amp: Sound Stream Van Gough 1600.2
    Electrical: Knu Flex 1/0, Batcap 2000 in back
    Rear Deck: No 6x9's just holes and grills

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    MisterE's Avatar
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    Re: Port Area/Box for 18" BTL

    Oh forgot to thank you, even though I didnt use your plan.

    Doing 123 sq in port area, box is about 7.9 cu ft. its huuuuuuge




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